1. Resource Constraints: Limited financial, human, and technological resources can make it challenging for small businesses to maintain consistent quality. 2. Supplier Variability: Dependence on external suppliers can lead to inconsistencies in raw materials or components. 3. Process Changes: As startups iterate on their products or services, ongoing changes can impact quality. 4. Skill Levels: The skills and experience of the team can vary, leading to fluctuations in quality.